Danley in Alabama church conversion
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The gymnasium was a large 120ft x 80ft x 22ft box covered with reflective surfaces, and Armstrong measured its reverb time at 7.5 seconds. However, the church had determined that they could place a generous stage along one of the long walls and still accommodate 900 church members.
"Diffusion panels would help kill the rather extreme flutter echo," Armstrong explained, "but there was still a massive slap-back echo from the back wall to the stage." To combat the problem, dB Audio and Video designed a regiment of two-inch absorption panels and installed them along the back wall. They soaked up most of the energy above 1kHz and a good deal below that frequency.
"Although we did